There are a couple notes of interest to keep in mind. Firstly, the effectiveness of the Devil Ring, although not hinted at in its description, does not go away once Shanoa restores HP. This, unfortunately, leads to the second note of interest; Shanoa must suffer around 9,900 points of damage if she wishes to improve the ring. This is enough to kill her outright at least 3 times, even at the level cap of 255.